package day20171221;

import java.io.*;
import java.util.HashMap;
import java.util.Map;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

/**
 * Created by Adminitrator on 2017/12/21.
 */
public class Text02 {
    public static void main(String[] args) {
        Map<String,Integer>map=new HashMap<>();
        //字符流
        BufferedReader reader=null;
        try {
            reader=new BufferedReader(new FileReader(
                    "C:\\Users\\Adminitrator\\Desktop\\key.txt"));
        String stuNo=null;
        while ((stuNo=reader.readLine())!=null){
            map.put(stuNo,0);
        }
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }finally {
            try {
                reader.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }


        //得到某一个文件夹下面所有文件
        File file=new File("C:\\Users\\Adminitrator\\Desktop\\16信本2班Java作业一");
        File[] files=file.listFiles();
        //遍历
        for (File f:files){
            String filename=f.getName();
            String no=null;
            Matcher matcher= Pattern.compile("信本2班(\\d+)")
                    .matcher(filename);
            while (matcher.find()){
               no= matcher.group(1);
            }
            map.put(no,1);
        }
        //打印所有值为0的同学,就是没有交作业的同学
        for(Map.Entry<String,Integer>entry:map.entrySet()){
            if (entry.getValue()==0){
                System.out.println(entry.getKey());
            }
        }
    }
}
